贡嘎山海螺沟土壤环境背景值特征

贡嘎山海螺沟土壤环境背景复杂,土壤元素背影值中,Cu,Zn,Pb,Cr,Ni,Mn和F都高于全国土壤的背景水平,而元素Cd,As,Se则相反;各土类间同一元素含量的变化不大;成土母质对土壤元素含量的影响深刻;土壤元素含量的垂直分异规律不明显。

CHARACTETISTICS OF ENVIRONMENT BACKGROUND VALUE OF HAI LUOGOU SOIL ON MT. GONGGA

Mt. Gongga is situated in the transitional belt from Qinghai- Xizang Plateau to Sichuan Basin. The main peak,the first peak of the Hengduan Mountains, is 7556m. Hailuogou belongs to a branch gully on east slope of Mt. Gongga, having a length of 30. 7km and a drainage area of 220km2.Hailuogou has great height difference. The relative height difference form mouth of the gully to peak is up to 6020m. The vertical differentiation of bioclimatic condition is clear. The parent materials are mostly slope deposits and glacial deposits of Quaternary, belonging to metamorphic rock, basic rock and interma ediate rock etc. The soil types are varied with altitude and form a complex vertical zone of soil.There is observed area for Alpin- Ecologic Observatory of Mt. Gongga of the Chinese Academy of Sciences in the basin. The characteristics of soil environment background value in this basin are mainly studies for the research item which supported by institute foundation. According to sample analysis, the main characteristics are: change order of soil content is F>Mn> Zn>Cr>Cu>Pb>Ni>Co>As>Se>Sd,among them the contents of Cu, Zm, Pb, Cr, Ni, Mn, F are higher than the background value of whole China, but Cd, As, Se are quite the contrary. The content changes of different soil types and parent soil are not distenct. The vertical differentiation law of soil contents are not obvious, too.